Chain saw sharpening machine



May 28, 1957 H. G. ROGERS CHAIN SAW SHARPENING MACHINE Filed Aug. 18, 1955 INVENTOR. HUGH G'. ROGERS ATTORNEYS United States ,Patent 2,793,544 CHAIN sAw SHARPENING MACHINE Hugh G. Rogers, Independence, `Oreg. Application August 1s, 195s, serial No. 529,172 1 Claim. (ci. 76-41) This invention relates to chain saw sharpening machines, and the primary object of this invention is to provide a simple clamping device for holding chain saws while Ibeing conditioned, the clamping device having an adjustable supporting element tor supporting an electric motor, having a grinding drum thereon for engaging the teeth of the chain saw, which is being held at a predetermined position by the clamp.

Means is provided for supporting the grinding drum at various fixed angles to the teeth of the saw depending upon the presetting of the position of the grinding drum.

This is a chain saw sharpening device of very simple construction, yet it will carry out the primary object and that is to accurately grind each tooth of the chain saw to a predetermined :angle or shape.

These and other incidental objects will be apparent in the drawings, specification and claim.

Referring to the drawings:

Figure 1 is a front elevational view of the device, bolted to a supporting bench.

Figure 2 is an end elevational view online 2-2 of Figure 1.

Figure 3 is ta fragmentary top plan view, taken on line 3 3 of Figure 1.

Figure 4 is a fragmentary ysectional view, taken on line 44 of Figure 2.

4Figure 5 is a yfragmentary sectional View, taken on line 5-5 of Figure 2.

Figure 6 is an inverted plan sectional view, taken on line 6 6 of Figure 1.

Referring more specifically to the drawings:

This new and improved chain saw grinding device consists of a base 10, having an upwardly extending pedestal 11 formed on one side thereof, and an upturned jaw 12 formed on the opposite side thereof, as best illustrated in Figure 2. A movable clamping jaw 13 is secured `to the face of the jaw 12 by screw 14, forming p'ait of the hand wheel 15.

The chain saw 16 is adapted to be clamped between the jaws 12-and 13 by their bar guides 17. The position of the chain 16 lengthwise of the jaws 12 and 13 is determined by the stop 18. The stop 18 forms part of the pivot-ally mounted arm 19, the raker 20 of the chain saw tooth abutting against this stop 18. The position of the stop 18 is determined Iby the position of the bracket 21, which is :adjustably secured t-o the jaw 13 by set screws 22 operating within the slot 23.

The arm 19 is rotatably mounted on the spindle 24 forming part of the bracket 21. The hub 25 of the arm 19 has a portion 26 thereof maintained by spring 51 in frictional engagement with the ear 27, forming part of the bracket 21.

A movable bracket I28 forms part of the guide 29. This guide 29 operates within the guideway 30 of the pedestal 11, as is best illustrated in Figures 1 and 6. The guide 29 is held in place by the plate 31. The guide Z9 and plate 31 embrace the legs 32 of the pedestal 11 of the device, taken ICC and operate freely therealong. One end. of la motor sup` portinglarm331is pivotally connected to the bracket 28 byE the bolt 34 and is held at thedesired angle to the pedestal 11 and the chain saw 16 by the locking bolt 35 and the wing nut 36.

, An adjustable screw 37 is threaded within the arm 33. A `spring loaded |ball 37A is located in the tip of the screw 37 and is adapted to enter the depressions 38 of the` bracket 28 holding the arm 33 at a predetermined angle to the chain saw 16 and a predetermined angle to i a horizontal plane.

A motor 39 is clamped to the arm 33 by way of the bracket 40. ,One end 41 of the bracket 40 surrounds the motor 39 while the opposite end 42 of the bracket 40 surrounds the arm 33. A guide bar 4.3 forms part of the arm 33 and is connected thereto at 44. The upper end of the bracket 40 is bifurcated at 45 embracing the guide bar 43. Wing set screws 46 are threaded within the bifurcated ends 45 and are adapted to engage the sides 0f the guide'bar 43 so that the clamping bracket 40 can be rotated and adjusted slightly `at the desired .angle about the supporting arm 33. This provides a tine and accurate `adjustment to the position of the motor 39.

Aixed to t-he shaft of the motor 39 is a grinding drum 47. This grinding drum 47 is adapted to engage the face 48 of the cutting teeth of the chain 16 las best illustrated in Figures 1, 2 and 3. The position of the grinding drum 47 is determined in regards to elevation and depth within the teeth of the saw 16 by the operation of the hand wheel 49 rotating the screw 50 within the head 51 of the guide 29, as best illustrated in Figures 1 and 2.

I will now describe the operation of this new and improved chain -saw sharpening machine. The hand wheel 15 is relaxed allowing the jaw 13 to separate from the jaw 12. The guide bar members 17 of the chain 16 are inserted between the jaws 12 and 13, then the raker 20 is brought temporarily against the st-op 18. The grinding drum 47 is next brought into position relative to the tace 48 of the cutting teeth of the saw 16 by first adjusting the arm 33 to the desired angle or cut, as .above described.

The ystop 18 is then Iadjusted so that the face 48 of the cutting tooth of the saw 16 will engage the grinding drum 47, after which the set screws 22 are tightened, holding the bracket 21, the arm 19, and stop 18 to the desired locati-on. After each tooth -face 48 has been ground the arm 19 is pulled towards the operator, removing the stop 18 from in front of the raker tooth 20 permitting the chain 16 to 'be moved to the next tooth following. In this movement the arm 19 is brought back, bringing the stop 18 in line with the next raker tooth.

When the saw chain 16 has been moved to the new location, the hand wheel 15 will be tightened cinching the jaws 12 and 13 tightly against the guide members 17 of the chain 16, holdingthe same while the grinding operation takes place. The wing screws 46 provides for accurate fine adjustment, although a slight pressure by the operator :against the motor forcing the grinding drum 47 against the tooth will ordinarily provide enough movement to grind the tooth by the actual feel and observation of the grinding operation.

Having described and illustrated one embodiment of this invention, it will ibe understood that the same is offered merely by way of example, and that this invention is to be limited only by the scope of the appended claim.

What is claimed is:

A chain saw sharpening device comprising a base, a

stationary clamping jaw mounted on sai-d base, a movable jaw, means adjustably securing said movable jaw to said stationary jaw to releasably secure said chain therein, :a pedestal extending upwardly from said stationary jaw mounted on said base, a guide block mounted |on said pedestal, means for effecting vertical reciprocation of `said block on said pedestal, a bracket extending laterally -from said block and having an end thereof xedly secured to said block, an elongated arm having an end thereof pivotally secured to said bracket, adjustable means connected with said bracket and intermediate the ends of said arm, said last named adjustable means relea-sably securing said arm in a pivoted selected position relative to said bracket, a motor having a drive'shaft, bracket means connected with yand -dependingfrom said arm, supporting said motor on said arm, means adjustably securing said bracket and motor in a selected position relative to said arm, a :cylindrical grinding Wheel xedly secured on said drive shaft for rotation therewith,

stopymeans pivotally mounted on said movable jaw for movement into and out of the path Iof movement of a saw tooth, and adjustable means connecting said stop means to lsaid movable jaw whereby said stop means may be moved longitudinally of said chain.

References Cited in the file of this patent UNITED STATES PATENTS 2,217,145 Stihl Oct. 8, 1940 2,318,456 Blum May 4, 1943 2,458,058 Carrol Jan. 4, 1949 2,568,062 Fitch Sept. A18, 1951 2,589,165 Toy et a1 Mar. 11, 1952 2,704,948 Le Grand Mar. 29, 1955 2,729,987 Bluemink Jan. 10, 1956 2,729,988 Beach Jan. 10, 1956 FOREIGN PATENTS Canada Mar. 15, 1949 

